EP0582059A3 - Magneto-optical head assembly. - Google Patents

Magneto-optical head assembly. Download PDF

Info

Publication number
EP0582059A3
EP0582059A3 EP93108881A EP93108881A EP0582059A3 EP 0582059 A3 EP0582059 A3 EP 0582059A3 EP 93108881 A EP93108881 A EP 93108881A EP 93108881 A EP93108881 A EP 93108881A EP 0582059 A3 EP0582059 A3 EP 0582059A3
Authority
EP
European Patent Office
Prior art keywords
magneto
head assembly
optical head
optical
assembly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP93108881A
Other languages
German (de)
French (fr)
Other versions
EP0582059A2 (en
EP0582059B1 (en
Inventor
Ryuichi Katayama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
Nippon Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP04140832A external-priority patent/JP3123216B2/en
Priority claimed from JP4192554A external-priority patent/JP3047630B2/en
Application filed by Nippon Electric Co Ltd filed Critical Nippon Electric Co Ltd
Publication of EP0582059A2 publication Critical patent/EP0582059A2/en
Publication of EP0582059A3 publication Critical patent/EP0582059A3/en
Application granted granted Critical
Publication of EP0582059B1 publication Critical patent/EP0582059B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/13—Optical detectors therefor
    • G11B7/131—Arrangement of detectors in a multiple array
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10532—Heads
    • G11B11/10541—Heads for reproducing
    • G11B11/10543—Heads for reproducing using optical beam of radiation
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/1055—Disposition or mounting of transducers relative to record carriers
    • G11B11/10576—Disposition or mounting of transducers relative to record carriers with provision for moving the transducers for maintaining alignment or spacing relative to the carrier
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0943—Methods and circuits for performing mathematical operations on individual detector segment outputs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1353—Diffractive elements, e.g. holograms or gratings

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)
EP93108881A 1992-06-02 1993-06-02 Magneto-optical head assembly Expired - Lifetime EP0582059B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP140832/92 1992-06-02
JP04140832A JP3123216B2 (en) 1992-06-02 1992-06-02 Magneto-optical head device
JP4192554A JP3047630B2 (en) 1992-07-21 1992-07-21 Magneto-optical head device
JP192554/92 1992-07-21

Publications (3)

Publication Number Publication Date
EP0582059A2 EP0582059A2 (en) 1994-02-09
EP0582059A3 true EP0582059A3 (en) 1995-01-25
EP0582059B1 EP0582059B1 (en) 1998-05-13

Family

ID=26473236

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93108881A Expired - Lifetime EP0582059B1 (en) 1992-06-02 1993-06-02 Magneto-optical head assembly

Country Status (3)

Country Link
US (1) US5353267A (en)
EP (1) EP0582059B1 (en)
DE (1) DE69318486T2 (en)

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5804814A (en) * 1994-05-20 1998-09-08 Musha; Toru Optical pick-up head and integrated type optical unit for use in optical pick-up head
US6185166B1 (en) 1993-06-21 2001-02-06 Fujitsu Limited Optical information recording/reproducing apparatus
JP3047342B2 (en) * 1993-06-21 2000-05-29 富士通株式会社 Optical information recording / reproducing device
DE4322149A1 (en) * 1993-06-21 1994-12-22 Fujitsu Ltd Optical information recording/reproducing device
JPH07130022A (en) * 1993-11-08 1995-05-19 Matsushita Electric Ind Co Ltd Optical head device and optical element
JPH07311961A (en) * 1994-05-16 1995-11-28 Nippon Steel Corp Optical pickup
KR100200832B1 (en) * 1994-11-29 1999-06-15 윤종용 Focus error detection device
DE69621678T2 (en) * 1995-03-14 2002-11-28 Toshiba Kawasaki Kk light detector
US5796701A (en) * 1995-06-23 1998-08-18 Sony Corporation Optical pickup and opto-magnetic signal reproducing apparatus
JPH0917029A (en) 1995-06-26 1997-01-17 Pioneer Electron Corp Optical disk and its reader and production of optical disk
US6292441B1 (en) * 1997-04-16 2001-09-18 Matsushita Electric Industrial Co., Ltd. Optical head device, optical information apparatus, and method for detecting focus error signal
JPH11161973A (en) * 1997-09-24 1999-06-18 Fujitsu Ltd Optical information recording/reproducing device
JP3063707B2 (en) * 1997-10-30 2000-07-12 日本電気株式会社 Optical head device
JPH11185279A (en) * 1997-12-16 1999-07-09 Fujitsu Ltd Optical information recording/reproducing device
US6418098B1 (en) * 1998-06-03 2002-07-09 Kabushiki Kaisha Toshiba Optical head apparatus for reproducing information from an optical recording medium
US20020182307A1 (en) * 1999-02-18 2002-12-05 City University Of Hong Kong Organic electroluminescent devices with organic layers deposited at elevated substrate temperatures
US6339565B1 (en) * 1999-03-31 2002-01-15 Lsi Logic Corporation Non-linear center-error generator for DVD servo control
JP2001014717A (en) * 1999-04-28 2001-01-19 Matsushita Electronics Industry Corp Optical device
US6822934B2 (en) * 2000-06-21 2004-11-23 Matsushita Electric Industrial Co., Ltd. Optical disc apparatus for finding a tracking error for an optical disk
JP4242108B2 (en) * 2001-06-04 2009-03-18 パナソニック株式会社 Optical pickup head and information recording / reproducing apparatus
CN100437780C (en) * 2001-06-04 2008-11-26 松下电器产业株式会社 Optical pickup head and information recording/reproducing device
WO2003041066A1 (en) * 2001-11-09 2003-05-15 Sharp Kabushiki Kaisha Light integration unit, optical pickup device using the unit, and optical disk device
JP4083720B2 (en) * 2004-09-17 2008-04-30 シャープ株式会社 Optical pickup device
US7421348B2 (en) * 2005-03-18 2008-09-02 Swanson Brian G Predictive emissions monitoring method
US8768664B2 (en) * 2005-03-18 2014-07-01 CMC Solutions, LLC. Predictive emissions monitoring using a statistical hybrid model
US11579014B1 (en) * 2020-08-20 2023-02-14 Amazon Technologies, Inc. Optical detector system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0285126A2 (en) * 1987-04-01 1988-10-05 Nec Corporation A head for a magnetooptic recording medium
EP0405444A2 (en) * 1989-06-26 1991-01-02 Nec Corporation Optical head

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5270996A (en) * 1986-12-25 1993-12-14 Nec Corporation Optical head with diffraction grating producing five diffracted detection light beams
DE3732944A1 (en) * 1987-09-30 1989-04-13 Thomson Brandt Gmbh OPTICAL SCANNER
JP2649231B2 (en) * 1987-11-20 1997-09-03 株式会社 日本コンラックス Optical information reproducing device
JP2583273B2 (en) * 1988-04-04 1997-02-19 株式会社日本コンラックス Optical information recording / reproducing method and apparatus
US5066138A (en) * 1988-06-16 1991-11-19 Mitsubishi Denki Kabushiki Kaisha Optical head apparatus
US4989189A (en) * 1988-08-22 1991-01-29 Eastman Kodak Company Magneto-optic playback apparatus including astigmatic diffracting means
JP2711010B2 (en) * 1990-04-04 1998-02-10 株式会社日本コンラックス Optical head

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0285126A2 (en) * 1987-04-01 1988-10-05 Nec Corporation A head for a magnetooptic recording medium
EP0405444A2 (en) * 1989-06-26 1991-01-02 Nec Corporation Optical head

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Y. ONO: "Use of Holographic Optical Elements in Optical Storage", IEEE LASERS AND ELECTRO-OPTICS SOCIETY ANNUAL MEETING CONFERENCE PROCEEDINGS, vol. 2, 1990, pages 75 - 78 *

Also Published As

Publication number Publication date
EP0582059A2 (en) 1994-02-09
DE69318486T2 (en) 1998-11-26
US5353267A (en) 1994-10-04
DE69318486D1 (en) 1998-06-18
EP0582059B1 (en) 1998-05-13

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